Final answer:
An impetigo lesion that becomes deeply ulcerated is known as ecthyma.
Step-by-step explanation:
An impetigo lesion that becomes deeply ulcerated is known as ecthyma. Impetigo is a skin infection that causes the formation of vesicles, pustules, and bullae. In nonbullous impetigo, the vesicles and pustules rupture and become encrusted sores, while in bullous impetigo, the bullae fill and rupture, resulting in larger, draining, encrusted lesions. However, when the impetigo lesion becomes deeply ulcerated, it is specifically referred to as ecthyma.